linux-kernel - [PATCH 1/6] usb: typec: Standardize PD Revision format with Type-C Revision

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Date:   Thu, 28 Jan 2021 22:14:01 -0800
From:   Benson Leung <bleung@...omium.org>
To:     heikki.krogerus@...ux.intel.com, enric.balletbo@...labora.com,
        pmalani@...omium.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     groeck@...omium.org, bleung@...gle.com, bleung@...omium.org
Subject: [PATCH 1/6] usb: typec: Standardize PD Revision format with Type-C Revision

The Type-C Revision was in a specific BCD format "0120H" for 1.2.
USB PD revision numbers follow a similar pattern with "0300H" for 3.0.

Standardizes the sysfs format for usb_power_delivery_revision
to align with the BCD format used for usb_typec_revision.

Example values:
- "2.0": USB Power Delivery Release 2.0
- "3.0": USB Power Delivery Release 3.0
- "3.1": USB Power Delivery Release 3.1

Signed-off-by: Benson Leung <bleung@...omium.org>
---
 Documentation/ABI/testing/sysfs-class-typec | 7 ++++++-
 drivers/usb/typec/class.c                   | 3 ++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
index 8eab41e79ce6..b61480535fdc 100644
--- a/Documentation/ABI/testing/sysfs-class-typec
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -105,7 +105,12 @@ Date:		April 2017
 Contact:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
 Description:
 		Revision number of the supported USB Power Delivery
-		specification, or 0 when USB Power Delivery is not supported.
+		specification, or 0.0 when USB Power Delivery is not supported.
+
+		Example values:
+		- "2.0": USB Power Delivery Release 2.0
+		- "3.0": USB Power Delivery Release 3.0
+		- "3.1": USB Power Delivery Release 3.1
 
 What:		/sys/class/typec/<port>/usb_typec_revision
 Date:		April 2017
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 8f77669f9cf4..4f60ee7ba76a 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1500,8 +1500,9 @@ static ssize_t usb_power_delivery_revision_show(struct device *dev,
 						char *buf)
 {
 	struct typec_port *p = to_typec_port(dev);
+	u16 rev = p->cap->pd_revision;
 
-	return sprintf(buf, "%d\n", (p->cap->pd_revision >> 8) & 0xff);
+	return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
 }
 static DEVICE_ATTR_RO(usb_power_delivery_revision);
 
-- 
2.30.0.365.g02bc693789-goog